JPH05220380A - Squib and its production - Google Patents

Abstract

PURPOSE:To easily and efficiently produce a squib with the bonding strength between an electrode pin and a heating wire increased and capable of playing various detonating performances. CONSTITUTION:A powder 14 and a heating wire 15 are arranged in a bottomed powder chamber 3 with the open part closed with a breakable cap 4, and an electrode pin 16 is connected to an input lead wire 19 outside the device through the bottom 1 of the chamber 3. The bottom 1 of the chamber 3 is formed by an outer annular conductor 5 and a closing insulating material 6 at the center, the powder 14 consists of an igniting powder 12 and a firing powder 13, the heating wire 15 is in contact with the igniting powder 12, one end of the heating wire 15 is directly connected to the tip of the first electrode pin 16 piercing the center of the closing insulating material 6 and the other end to the annular conductor 5 in the chamber, and the second electrode pin 17 is directly connected to the conductor 5 from outside the chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squib which also serves as an ignition device for an emergency gas generating agent for fixing a seat belt or the like, and a method for manufacturing the squib.

[0002]

2. Description of the Related Art A seat belt of an automobile or the like is equipped with an emergency gas generator for fixing it in an emergency.
Emergency gas generators often consist of an emergency gas generant and an ignition squib for burning it.

Generally, a squib has a bottomed cylindrical case body filled with an explosive powder, and a base closes the opening. Conventionally, the board 30 has a through hole at the center as shown in the sectional view of FIG. 5, two electrode pins 31 are inserted in parallel to the through hole, and a nichrome wire 32 is welded to the tip of the electrode pin 31. ing. The electrode pin 31 is bent in a V shape at the insertion portion, is fixed by an insulating material 33 so as not to come off, and is connected to an input lead wire (not shown). A multi-core wire is usually used for the input lead wire.

[0004]

In the case of the conventional squib, there is a problem in that it is difficult to connect the electrode pin and the nichrome wire in the manufacturing process, which requires skill, and the adhesive strength is weak even after completion. Therefore, there are problems that productivity is low, product quality varies, and ignition reliability is low.

The present invention has been made to solve the above problems, and provides a squib in which the coupling between the electrode pin and the heating wire is strong and various ignition performances can be stably realized. An object of the present invention is to provide a method capable of easily and efficiently producing a simple squib.

[0006]

The squib of the present invention, which has been made to achieve the above-mentioned object, has a bottomed end whose opening is closed by a pawl cap 4, as shown in a sectional view of FIG. In the squib in which the explosive charge 14 and the heating wire 15 are arranged inside the explosive charge chamber 3, and the electrode pin 16 passes through the bottom part 1 of the explosive charge chamber 3 and is connected to the outdoor input lead wire 19, 1 is composed of an outer ring-shaped conductor 5 and a closing insulating material 6 in the center thereof, and the explosive charge 14 has a two-layer structure including an ignition charge 12 and an ignition charge 13, and a heating wire 15 is in contact with the ignition charge 12. , One end of the heating wire 15 is directly connected to the tip of the first electrode pin 16 penetrating the center of the closed insulating material 6, and the other end is directly connected to the annular conductor 5 in the room, and the annular conductor 5 is connected to the second electrode pin. 17 is directly connected from the outside.

In the squib manufacturing method of the present invention, the tip of the first electrode pin 16 is inserted through the center of the annular conductor 5 to bury the blocking insulating material 6, and the heating wire 1 is attached to the tip of the first electrode pin 16.
5, one end of which is connected, and then the annular conductor 5 and the heating wire 15
The cylindrical body 2 is extended from the peripheral edge of the annular conductor 5 with the heating wire 15 side inward so as to form the explosive chamber 3, and the ignition wire 12 is further attached to the heating wire 15 in contact with the heating wire 15. Overlay gunpowder 13 2
The layer is filled with gunpowder 14, the opening is sealed with a claw breaking cap 4, and the second electrode pin 17 is attached to the annular conductor 5 from the outside of the room.
And the electrode pins 16 and 17 are connected to the input lead wire 19.

[0008]

In the squib of the present invention, the heating wire 15 is connected to the explosive chamber 3
The annular conductor 5 and the first electrode pin 16 located at the center of the circle are electrically connected to each other inside the bottom portion 1. In forming the bottom portion 1 of the explosive chamber 3, once the tip of the first electrode pin 16 and one end of the heating wire 15 are connected,
After that, the heating wire 15 can be electrically connected to the second electrode pin 17 in almost any direction of the heating wire 15.
As compared with the case where the connecting positions at both ends of the heating wire 15 are fixed in advance, the formation is easy and the connection of the electric path is strong. Gunpowder room 3
Can be downsized.

The explosive chamber 3 is filled with an ignition charge 13 and an ignition charge 12. It is possible to change the combination of the ignition charge 13 and the ignition charge 12.

[0010]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a sectional view of an embodiment of a squib to which the present invention is applied.

A non-combustible cylinder 2 extends from a peripheral edge of a disk-shaped ignition portion base body 1 forming a bottom portion to form an explosive chamber 3. The open portion of the explosive chamber 3 is hermetically closed by a bottomed tubular cap 4 having a long tubular portion, and the cap 4 substantially covers the outer periphery of the tubular wall of the explosive chamber 3. The cap 4 is formed of a so-called nail-breaking material such as aluminum foil that can be easily broken by a nail.

FIG. 2 is a sectional view of the ignition base body 1. The igniter base 1 is formed of a ring-shaped conductor 5 having a through hole concentric with the peripheral edge formed at the center and a fitting step formed at the outer edge, and a closed insulating material 6 at the center. The annular conductor 5 is made of Kovar, which is a nickel-cobalt alloy, and the through hole has a larger diameter on one surface than on the other surface side, and as shown in FIG. Is non-combustible insulating glass powder 7
Is filled, and the insulating resin 8 is filled near the other surface.

The interior of the explosive chamber 3 is as shown in FIG.
A partition plate 11 partitions the hollow volume adjusting chamber 9 covered by the cap 4 and the explosive filling chamber 10 on the bottom side. The partition plate 11 is formed by solidifying silicon powder into a plate shape with an adhesive.
The peripheral edge is fitted to the inner circumference of the explosive chamber 3.

In the explosive filling chamber 10, the bottom side is filled with the igniting charge 12, and the igniting charge 13 is overlaid on the bottom side of the partition plate 1.
2 and two types of explosives 14 between the ignition unit base 1 and the ignition unit base 1 without a gap
Formed and filled in layers. The ignition powder 13 is a zirconium-potassium perchlorate system. Ignition charge 12
The tricinate potassium perchlorate system is used for.

A nichrome wire 15 is provided on the ignition base body 1. The nichrome wire 15 is virtually embedded in the ignition charge 12. One end of the nichrome wire 15 is located at the center of the through hole of the annular conductor 5 filled with the blocking insulating material 6 as a first hole.
The tip of the electrode pin 16 on one end side penetrates and is directly connected thereto. The other end of the nichrome wire 15 is directly connected to the annular conductor 5.

The one end of the second electrode pin 17 is connected to the outer surface of the ring-shaped conductor 5, which is the outer periphery of the explosive chamber 3. Both the first electrode pin 16 and the second electrode pin 17 are made of a nickel-cobalt alloy, and the input lead wire 19 is soldered to the flat portion 18 which is flattened at the tip of the other end. The input lead wire 19 is formed of a multi-core wire and is connected to an external power source (not shown).

The flat portion 1 connected to the input lead wire 19
8 is inserted in the double-ended frame 20. The double-ended frame 20 is composed of an aluminum alloy flanged tube 21 and a ferrite tube 22 housed in the tube. One end of the flanged tube 21 is formed thin, the outer periphery is provided with a step portion at the center, and the other end is provided with a collar. The inner circumference is provided with unevenness at the other end, and the ferrite tube 22 is inserted from one end with the central axes aligned with each other, and the other end of the ferrite tube 22 collides with the unevenness. A partition wall 23 including the central axis in the length direction of the tube as a surface is formed in the ferrite tube 22 so as to extend in the length direction of the tube, and a passage having a substantially elliptical cross section is sandwiched across the partition wall 23. Two pipes are formed parallel to each other in the length direction of the pipe. The coupling portion of each electrode pin is separately inserted into each passage of the ferrite tube 22.

The central portions of the first electrode pin 16 and the second electrode pin 17 are respectively bent, and the explosive chamber 3 and the double-ended frame 20 are provided.
And are arranged in series with their central axes on the same line. The outer periphery of the cylindrical portion of the cap 4 that covers the explosive chamber 3 is fixed with a nylon body resin 24, and the nylon body resin 24 is
Covering the bent portions of the electrode pin 16 and the second electrode pin 17,
The double-ended frame 20 and the explosive chamber 3 are integrally fixed by extending from one end of the double-ended frame 20 to the above step. The nylon body resin 24 is also filled in a portion of the double-ended frame 20 where irregularities are formed on the inner circumference of the other end of the flanged tube 21, and the input lead wire 19 is fixed to the double-ended frame 20.

Such a squib is manufactured as follows.

The other ends of the first electrode pin 16 and the second electrode pin 17 are crushed to form a flat portion 18.

The igniter base 1 is formed. A through hole is provided in a circle concentric with the peripheral edge, and the annular conductor 5 made of Kovar is formed.
A fitting step is formed on the peripheral edge. The diameter of the through-hole is larger on one surface than on the other surface. 1st electrode pin 1
The front end of one end of 6 is inserted through the through hole from the other surface toward the one surface. Next, the non-combustible insulating glass powder 7 is filled near one surface of the through hole, and the insulating resin 8 is filled near the other surface to close the through hole.

One end of the nichrome wire 15 is connected to one end of the first electrode pin 16 on one surface of the ignition portion base 1, and then the other end of the nichrome wire 15 is connected to the annular conductor 5.

An incombustible cylinder 2 is erected on the outer circumference of the annular conductor 5 to form a powder chamber 3. The explosive charge chamber 3 is filled with explosive charge 14. First, the ignition charge 12 is filled, and then the ignition charge 1
Fill 3. The outer periphery of the partition plate 11 is fitted to the upper surface of the ignition powder 13 on the inner periphery of the cylindrical body 2, and the hollow volume adjusting chamber 9 is provided on one end side and the explosive filling chamber 10 is provided on the other end side. Partition board 11
Is formed by solidifying silicon powder into a plate with an adhesive.

The open side of the volume adjusting chamber 9 is provided with a claw breaking cap 4
Seal with. The claw-breaking cap 4 is a bottomed cylindrical body having a long cylindrical portion, and in fact the peripheral wall of the explosive chamber 3 is also covered with the cap 4.

One end of the second electrode pin 17 is connected to the outside of the explosive chamber 3 and the outer peripheral surface of the annular conductor 5. Each of the pair of input lead wires 19 leading to a power source (not shown) is separately inserted into each of the ducts of the ferrite tube 22 described above.
Is inserted into the above-mentioned collared tube 21. Each tip of the input lead wire 19 is connected to the flat portion 18 of each of the first electrode pin 16 and the second electrode pin 17, and the connecting portion is connected to the ferrite tube 22.
Cover with each pipeline.

The first electrode pin 16 and the second electrode pin 17 are bent in the middle, and the central axes of the explosive chamber 3 and the double-headed frame 20 are aligned on the same line, and both are arranged in series in a predetermined mold. To do. The outer periphery of the body of the cap 4 covering the explosive chamber 3 is fixed with a nylon body resin 24, and the nylon body resin 2
4, the circumference of the bent portion of each electrode pin 16 and 17 is covered, and the double-ended frame 20 is integrally fixed up to the stepped portion.

Collared pipe 21 that constitutes the double-ended frame 20
The nylon body resin 24 is also filled in the portion where the unevenness is formed on the inner circumference of the other end of the double-ended frame 20 and the input lead wire 19 are fixed.

When a voltage is applied to the input lead wire 19, the squib manufactured in this manner passes through the first electrode pin 16 and the second electrode pin 17 and a current flows through the nichrome wire 15 to generate heat, thereby generating an ignition charge. 12 ignites. Then, the heat causes the ignition powder 13 to burn, the fitting of the partition plate 11 is removed, and the cap 4
A flame is blown out toward the other end of the squib.

In the case of the squib of this embodiment, the partition plate 11
At this position, the filling amounts of the igniting charge 12 and the igniting charge 13 can be adjusted appropriately in the volume adjusting chamber 9, and the collapse of the filling does not occur.

Since the portion of the annular conductor 5 through which the first electrode pin 16 is inserted is filled with the insulating glass powder 7, the filler is carbonized during combustion and the first electrode pin 16 is likely to come off. Not even.

Input lead wire 19 of each electrode pin 16, 17
Since the flat portion 18 is formed in the connecting portion with the end portion of the above, the contact area is wide, so that it is easy to form in manufacturing, and the connecting strength between the input lead wire 19 and the electrode pins 16 and 17 is also strong. Since the cross section of the duct of the ferrite tube 22 constituting the double-ended frame 20 is elliptical, it can be easily inserted even if the cross section of the joint is not circular, and the manufacturing is easy. Since the flat portion 18 is surrounded by the separate ducts of the ferrite tube 22, there is no risk of the input lead wire 19 fraying and short-circuiting. There is no need to assemble while fearing a short circuit during production, and production efficiency is improved. It also prevents radio interference to the surroundings.

Collared pipe 21 that constitutes the double-ended frame 20
Since the nylon body resin 24 is also filled in the irregularities on the inner circumference at one end to fix the double-ended frame 20 and the input lead wire 19, the input lead wire 19 is hardly detached.

In this embodiment, the tritonate potassium perchlorate system is used as the ignition charge 12. In addition to this, the ignition charge 12 generally used as the ignition charge 12 may be used. From the viewpoint of safety, potassium tricinate perchlorate is preferable.

A nichrome wire 15 is used as the heating wire. In addition to this, a platinum wire may be used. Considering the welding strength with the first electrode pin 16, the durability of the welded portion, and the small change in resistance value due to temperature change,
Nichrome wire 15 is preferred.

The material of the ring-shaped conductor 5, the first electrode pin 16, and the second electrode pin 17 may be other metal than Kovar. However, when the insertion portion of the first electrode pin 16 is filled with the insulating glass powder 7, Kovar maintains stable airtightness because of the close thermal expansion coefficient,
preferable.

The flanged tube 21 is not made of an aluminum alloy, and other light metal or plastic material may be used.
However, considering the lightness and strength, aluminum alloy is preferable.

The nylon body resin 24 may be any thermoplastic low melting point resin, and not only nylon but also polyethylene,
Polyester or the like may be used. Considering the exothermic temperatures of the igniting charge 12 and the igniting charge 13, low melting point nylon is preferable in terms of safety.

[0039]

As described above in detail, the squib of the present invention or the squib obtained by the manufacturing method of the present invention has a strong bond between the electrode pin and the heating wire. The manufacturing method is easy and efficient.

By changing the combination of the ignition powder and the ignition powder, various ignition sensitivity can be stably selected. By flattening the coupling part of each electrode pin with the input lead wire end, the coupling strength will be stronger, and if you insert it into the multi-port frame, you will not worry about the input lead wire fraying and short-circuiting.
It eliminates the hassle of assembling while fearing a short circuit during manufacturing. Production efficiency also increases.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a squib to which the present invention is applied.

FIG. 2 is a cross-sectional view of an ignition portion base body of an embodiment of a squib to which the present invention is applied.

FIG. 3 is a front view of an ignition portion base body of an embodiment of a squib to which the present invention is applied.

FIG. 4 is a cross-sectional view taken along the line BB ′ of FIG.

FIG. 5 is a cross-sectional view of a conventional squib base.

FIG. 6 is a front view of a base of a conventional squib.

[Explanation of symbols]

1 is an ignition base, 3 is an explosive chamber, 4 is a claw cap, 5
Is an annular conductor, 6 is a closed insulating material, 12 is an ignition charge, 13 is an ignition charge, 14 is an explosive charge, 15 is a heating wire, 16 is a first electrode pin, 17 is a second electrode pin, and 19 is an input lead wire. is there.

Claims (4)

[Claims] 1. An explosive and a heating wire are arranged in a bottomed explosive chamber whose opening is closed by a claw cap, and an electrode pin is connected to an outdoor input lead wire through the bottom of the explosive chamber. In the squib, the bottom of the explosive chamber is formed of an annular conductor and a blocking insulating material in the center thereof, and the explosive is in two layers of ignition powder and ignition powder, and the heating wire contacts the ignition powder and the One end of the heating wire is directly connected to the tip of the first electrode pin penetrating the center of the blocking insulating material, and the other end is directly connected to the annular conductor inside the room, and the second electrode pin is directly connected to the annular conductor from outside the room. A squib characterized by that. 2. The input lead wire side end portion of each of the first electrode pin and the second electrode pin is flat, and a multi-core input lead wire is welded to the flat portion. Squib. 3. The end of the first electrode pin is inserted into the center of the ring-shaped conductor to bury a blocking insulating material, one end of the heating wire is connected to the tip of the first electrode pin, and then the ring-shaped conductor and the heating wire are connected. Connecting the other end, with the heating wire side facing inward, a cylinder is extended from the outer periphery of the annular conductor to form a powder chamber, and an ignition powder, and further an ignition powder are layered in contact with the heating wire to form two layers. Manufacture of a squib, characterized in that it is filled with explosive powder, the opening is closed with a claw breaking cap, the second electrode pin is connected to an annular conductor from the outside of the room, and each electrode pin is connected to an input lead wire. Method. 4. The input lead wire coupling portion of the first electrode pin and the second electrode pin is flattened, and a multi-core input lead wire is welded to the flattened portion. Squib manufacturing method.